Comment on ``Inseparability Criteria for Continuous Bipartite Quantum States''

Realignment Entanglement Criterion for Continuous Bipartite Symmetric Quantum States

The separability of bipartite non-Gaussian states is studied by applying the realignment criterion with the technique of functional analysis. The realignment criterion is given as one inequality in contrast to the infinitive number of inequalities based on the moments. We give the necessary and sufficient condition of inseparability for non-Gaussian states prepared by photon subtraction or addition from symmetric Gaussian states. The entanglement criterion of non-Gaussian states evolved in thermal noise and amplitude damping environment is also obtained.

Quantum Entanglement and the Generalized Uncertainty Principle

We examine quantum gravity effects on entanglement by a straightforward application of the generalized uncertainty principle (GUP) to continuous-variable systems. In particular, we study the following cases: the modified uncertainty relation of two identical entangled particles (Rigolin, 2002), and the inseparability conditions for entangled particles in the bipartite (Duan, Giedke, Cirac and Zoller, 2000) and tripartite (van Loock and Furusawa, 2003) cases. Rigolin showed a decrease in the lower bound of the product of the uncertainties of the position and momentum for two identical entangled…

连续变量系统的完全多体导引不可分性、真多体导引与单配性

Full multipartite steering inseparability, genuine multipartite steering and monogamy for continuous variable systems

本文推导检测连续变量系统真多体导引的不等式，区分完全导引不可分性与真导引，并展示通过分束器网络创建真导引态，实验确认三体导引，分析单配性，不依赖高斯态假设。

评论“将Kochen-Specker集合最优转换为二部完美量子策略”

Comment on "Optimal conversion of Kochen-Specker sets into bipartite perfect quantum strategies"

本文评论Trandafir和Cabello的论文，指出其中存在大量错误、不一致和低效问题，并在正文中详细讨论。

Comment on "Quantum discord through the generalized entropy in bipartite quantum states"

In [X.-W. Hou, Z.-P. Huang, S. Chen, Eur. Phys. J. D 68, 1 (2014)], Hou et al. present, using Tsallis' entropy, possible generalizations of the quantum discord measure, finding original results. As for the mutual informations and discord, we show here that these two types of quantifiers can take negative values. In the two qubits instance we further determine in which regions they are non-negative. Additionally, we study alternative generalizations on the basis of Rényi entropies.

对Pavičić的评论“关于‘将Kochen-Specker集最优转化为二分完美量子策略’的评论”的回复 (arXiv:2502.13787)

Reply to Pavičić's 'Comment on "Optimal conversion of Kochen-Specker sets into bipartite perfect quantum strategies"' (arXiv:2502.13787)

本文回复Pavičić的评论，指出其指责源于采用了不同的KS集定义（即“扩展”KS集），并从实验观测语境性和生成二分完美量子策略等物理角度论证了关注原始KS集的合理性。

Comment on "Local Copying of $d\times d$-dimensional Partially Entangled Pure States"

Recently, Li. \emph{et. al.} [Int. J. Theor. Phys., 48, 2777 (2009)] derived a necessary and sufficient condition for LOCC cloning of a set of bipartite orthogonal partially but equally entangled state. We demonstrates that, the result is based on a wrong observation regarding a set of non-maximally entangled states with equal entanglement. We also provide a simple example in favor of our comment.

Local uncertainty relations serving as measures of entanglement in a bipartite two-level system

We comment on the recent suggestion to use a family of local uncertainty relations as a standard way of quantifying entanglement in two-qubit systems. Some statements made on the applicability of the proposed "measures" are overly optimistic. We exemplify how these specific "measures" fall short, and present a minor modification of the general theory which uses the same experimentally gathered information, but in a slightly different, better way.

Comment on "Connection between entanglement and the speed of quantum evolution"

Batle et al. [Phys. Rev. A {\bf 72}, 032337 (2005)] and Borrás et al. [Phys. Rev. A {\bf 74}, 022326 (2006)] studied the connection between entanglement and speed of quantum evolution for certain low-dimensional bipartite quantum states. However, their studies did not cover all possible cases. And the relation between entanglement and the maximum possible quantum evolution speed for these uncovered cases can very different from the ones that they have studied.

暴胀期间原始马约拉纳场的二分纠缠

Bipartite entanglement of the primordial Majorana during inflation

利用马约拉纳费米子探针，在轴子暴胀背景下推导模式方程和哈密顿量，通过玻戈留波夫变换计算冯·诺依曼熵和对数负性，发现轻质量马约拉纳模式在超视界尺度保持增强的二分量子性。

优化基于负部分转置纠缠判据的置信度

Optimizing confidence in negative-partial-transpose-based entanglement criteria

本文提出一种统计框架，通过评估Shchukin和Vogel层级中各NPT判据在有限测量和噪声下的置信度，选择最优纠缠判据，并应用于多种高斯与非高斯态，具有广泛适用性。

Multipartite entanglement and quantum Fisher information in conformal field theories

Bipartite entanglement entropy of a segment with the length $l$ in $1+1$ dimensional conformal field theories (CFT) follows the formula $S=\frac{c}{3}\ln l+γ$, where $c$ is the central charge of the CFT and $γ$ is a cut-off dependent constant which diverges in the absence of an ultraviolet cutoff. According to this formula, systems with larger central charges have {\it{more}} bipartite entanglement entropy. Using quantum Fisher information (QFI), we argue that systems with bigger central charges not only have larger bipartite entanglement entropy but also have more multipartite entanglement co…

对"在BESIII过程中控制量子相干性和量子相关性动态演化"的评论

Comment on "Controlling the dynamical evolution of quantum coherence and quantum correlations in $e^{+} e^{-} \rightarrow Λ\barΛ$ processes at BESIII''

本文批判性地审查了最近关于超子-反超子系统在$e^{+} e^{-} \rightarrow Λ\barΛ$过程中的量子相干性、操控和非马尔可夫动态的声称，指出理论框架存在根本性物理不一致，质疑量子相关性和其动态行为的物理相关性。